Blue Open-Top Cap, Bonded Interseal PTFE/Silicone, Slit 2mL Vials Kit, Amber Glass Spot, 12x32mm, 9mm Screw Thread, Blue Open Top Cap and PTFE/Silicone Waters Sample Vials and Accessories. LC/GC Certified Vials are UV-tested by HPLC. The HPLC test Waters recommends pre-slit PTFE/silicone septa, for venting and accurate sample draw. Aijiren ...